CN105044553A - Underground power cable fault distance measuring device - Google Patents
Underground power cable fault distance measuring device Download PDFInfo
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- CN105044553A CN105044553A CN201510358615.6A CN201510358615A CN105044553A CN 105044553 A CN105044553 A CN 105044553A CN 201510358615 A CN201510358615 A CN 201510358615A CN 105044553 A CN105044553 A CN 105044553A
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- 230000005611 electricity Effects 0.000 claims description 7
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Locating Faults (AREA)
Abstract
The invention provides an underground power cable fault distance measuring device which is characterized by comprising a cable open-circuit fault detection which comprises a protective capacitor C, a potentiometer and a voltmeter. The output end of the protective capacitor C is connected with the A wire of a cable. The potentiometer R is connected in parallel with the voltmeter and then the output end is connected with the B wire of the cable. A 220V power supply is connected between the input end of the parallel-connected circuit and the input end of the protective capacitor C. The beneficial effects of the underground power cable fault distance measuring device are that the structure is simple, use is convenient and construction cost is low so that short-circuit, open-circuit and electric leakage fault distance can be measured from one end of the cable.
Description
Technical field
The invention belongs to field of electrical equipment, relate to the distance measuring equipment of cable short circuit, open circuit, leak current fault, particularly relate to a kind of underground power cable fault location device.
Background technology
Along with the generally application of underground cable, underground cable is often damaged, causes short circuit, open circuit, leak current fault, not only can affect the stable of power supply, even jeopardize personal safety, bring unnecessary trouble or loss, but be very difficult to looking up the fault, therefore find above situation extremely important.
Summary of the invention
The present invention, in order to make up the deficiencies in the prior art, provides the underground power cable fault location device that a kind of structure is simple, easy to use.
The present invention is achieved through the following technical solutions:
Underground power cable fault location device of the present invention, it is characterized in that: comprise alternating current evener, it comprises an electric capacity C, and two current coil L1, L2, the current transformer of an induced voltage coil L3 three composition, two current coil L1, L2 is in parallel, the output terminal of electric capacity C connects current coil L1, the input end of L2, current coil L1, L2 is that electric current is equal, two coils that direction of current is contrary, L1 is forward current coil, L2 is negative-phase sequence curent coil, L3 is induced voltage coil, electric capacity C is current limiting capacitance, 1 pin, 2 pin are alternating current input, 3 pin, 4 pin are that electric current exports, 5 pin are zero line, 6 pin, 7 pin are that induced voltage exports, 6 pin, digital voltmeter is connected between 7 pin, change the capacity of electric capacity C, various cable and line fault can be surveyed.
Underground power cable fault location device of the present invention, also comprises cable short circuit, earth detector, and this device connects potentiometer by between 6 pin of alternating current evener, 7 pin, and potentiometer connects voltage amplifier, and voltage amplifier connects voltage table.
Underground power cable fault location device of the present invention; also comprise electric discontinuity of cable pick-up unit; this device comprises protection electric capacity C, potentiometer and voltage table; protection electric capacity C output terminal is connected with the A line of cable; after potentiometer R is in parallel with voltage table; output terminal is connected with the B line of cable, and the input end of parallel circuit is connected 220V power supply with between the input end of protection electric capacity C.
The balance method of alternating current evener, 3,4,5 pin O point be connected, electric current through electric capacity C to L1, L2 coil, to 3 pin, 4 pin, to O point, to 5 pin, to 1 pin, L1, L2 two electric currents of coil are equal, electric current is contrary, cancel out each other in magnetic field, L3 does not just have induced voltage, and 6 pin, 7 pin just do not have voltage to export.
The method of detection streamer short circuit, current balancing device 3 pin, 4 pin connect cable head A, B phase, and 5 pin connect 4 pin, A, B line to line fault, the electric current of 3 pin through cable A phase to short dot, again from B phase to O point, to 5 pin, the electric current of 4 pin is to O point, again to 5 pin, and head end A, B phase of cable has resistance to short dot, and on 3 pin, 4 pin, electric current is just uneven, 6 pin, 7 pin just have voltage to export, the distance of cable A, B phase short dot and cable head is longer, and resistance is larger, and 6 pin, 7 pin voltages are higher; First correct with the cable of known length and short dot distance, through voltage amplifier amplification, potentiometer adjustment, make the corresponding 1 meter of short dot distance of 1V voltage on voltage table; During detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable short-circuit position to head end.
The method of detection streamer electric leakage, current balancing device 3 pin, 4 pin connect A, B two-phase of cable head, and cable tail end A, B two-phase is connected, 5 pin ground connection, 3 pin electric currents through the A phase of cable to tail end, then by B phase to electric leakage with clicking and entering; 4 pin electric currents click and enter ground through the B phase of cable to electric leakage.Because leakage is different to the resistance value of 3 pin, 4 pin, so current balancing device is just uneven, 6 pin, 7 pin just have voltage to export, and leakage and cable tail end are apart from longer, and resistance is larger, and 6 pin, 7 pin voltages are higher; First correct with the cable of known length and leakage distance, through voltage amplifier amplification, potentiometer adjustment, make the corresponding 1 meter of leakage distance of 1V voltage on voltage table; During detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable tail end to leakage.
The method of detection streamer open circuit, voltage is through electric capacity C by cable A phase, because cable A, B two-phase has line capacitance, B phase line just produces capacitance voltage; First correct with the cable of known length and breakpoint distance, adjustment potentiometer, make the corresponding 1 meter of breakpoint distance of 1V voltage on voltage table; During detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable open-circuit point to head end.
Because have potentiometer inside circuit, can adjusting resistance size, some step voltage amplifying circuits are had inside voltage amplifier, voltage table detects the voltage levels that voltage amplifier finally exports, the height of the output voltage that potentiometer resistance variable effect voltage table records, by cable short circuit, earth detector connects the cable of known length and short circuit distance in advance, by adjustment potentiometer, make the reading of output voltage and digital voltmeter corresponding consistent with short circuit distance, the i.e. corresponding 1 meter of distance of 1V, after such check and correction completes, the cable under test changing known cable into same model detects, the numeral of voltage table display is exactly the distance of short dot to cable head.Before detection streamer electric leakage, also use the cable of known length and leakage distance, by adjustment potentiometer, proofread, make the corresponding 1 meter of distance of 1V, after having proofreaded, cable under test known cable being changed into same model just can detect.
The invention has the beneficial effects as follows, structure is simple, easy to use, and cost is low, can measure short circuit, open circuit, leak current fault distance from cable one end.
Accompanying drawing explanation
Fig. 1 is electric discontinuity of cable failure detector circuit schematic diagram.
Fig. 2 is the schematic equivalent circuit of alternating current evener.
Fig. 3 is cable short trouble testing circuit schematic diagram.
Fig. 4 is cable leakage testing circuit schematic diagram.
The distance (rice) of the numeral fault in the present invention shown by digital voltmeter.
Embodiment
Accompanying drawing is a kind of specific embodiment of the present invention.
Fig. 1 is electric discontinuity of cable fault test circuitry figure.Electric discontinuity of cable failure detector comprises protection electric capacity C, potentiometer and voltage table; protection electric capacity C output terminal is connected with the A line of cable; after potentiometer R is in parallel with voltage table, output terminal is connected with the B line of cable, and the input end of parallel circuit is connected 220V power supply with between the input end of protection electric capacity C.Adjustment potentiometer, makes voltage reach within the range of voltage table.Voltage is through electric capacity C by cable A phase, because A, B two-phase has line capacitance, B phase line just produces capacitance voltage; First correct with the cable of known length and breakpoint distance, adjustment potentiometer, makes voltage table show numeral (V) corresponding to the distance (rice) of head end with cable open-circuit point, even if the corresponding 1 meter of breakpoint distance of 1V voltage on voltage table.During detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable open-circuit point to head end.
Fig. 2 is alternating current equalizer circuit figure.For solving short circuit, leak current fault, the resistance value of cable line can be made to transfer voltage to, and the present invention devises current balancing device.Current balancing device is by an electric capacity C, and two current coil L1, L2, the current transformer of an induced voltage coil L3 three composition constitutes equivalent electrical circuit, two current coil L1, L2 is in parallel, and the output terminal of electric capacity C connects current coil L1, the input end of L2, current coil L1, L2 is that electric current is equal, two coils that direction of current is contrary, L1 is forward current coil, and L2 is negative-phase sequence curent coil, and L3 is induced voltage coil, and electric capacity C is current limiting capacitance, changes the capacity of electric capacity C, can survey various cable and line fault, 1 pin, 2 pin are alternating current input, 3 pin, 4 pin are that electric current exports, and 5 pin are zero line, 6 pin, 7 pin are that induced voltage exports, 6 pin, digital voltmeter is connected, 3 between 7 pin, 4, 5 pin are connected at O point, and electric current is through electric capacity C to L1, L2 coil, to 3 pin, 4 pin, to O point, to 5 pin, to 1 pin, L1, the electric current of L2 two coil is equal, and electric current is contrary, and cancel out each other in magnetic field, L3 does not just have induced voltage, 6 pin, 7 pin just do not have voltage to export.
Fig. 3 is cable short-circuit test figure.Current balancing device 3 pin, 4 pin connect cable head A, B phase, 5 pin connect 4 pin, AB line to line fault, the electric current of 3 pin through the A phase of cable to short dot, the point from B phase to O again, to 5 pin, the electric current of 4 pin to O point, then to 5 pin, head end A, B phase of cable has resistance to short dot, on 3 pin, 4 pin, electric current is just uneven, and 6 pin, 7 pin just have voltage to export, and the distance of cable A, B phase short dot and cable head is longer, resistance is larger, 6 pin, 7 pin voltages are higher, amplify, adjust through voltage amplifier, and the numeral of voltage table display is exactly the distance of short dot to cable head.
Fig. 4 is cable leakage test pattern.Current balancing device 3 pin, 4 pin connect A, B two-phase of cable head, and cable tail end A, B two-phase is connected, 5 pin ground connection, and 3 pin electric currents to tail end, then click and enter ground by B phase to electric leakage through the A phase of cable.4 pin electric currents click and enter ground through the B phase of cable to electric leakage.Because leakage is different to the resistance value of 3 pin, 4 pin, so current balancing device is just uneven, 6 pin, 7 pin just have voltage to export, leakage and cable tail end longer, resistance is larger, 6 pin, 7 pin voltages are higher, amplify, adjust through voltage amplifier, and the numeral of voltage table display is exactly the distance of tail end to leakage.
Claims (8)
1. a underground power cable fault location device, it is characterized in that: comprise alternating current evener, it comprises an electric capacity C, and two current coil L1, L2, the current transformer of an induced voltage coil L3 three composition, two current coil L1, L2 is in parallel, the output terminal of electric capacity C connects current coil L1, the input end of L2, current coil L1, L2 is that electric current is equal, two coils that direction of current is contrary, L1 is forward current coil, L2 is negative-phase sequence curent coil, L3 is induced voltage coil, electric capacity C is current limiting capacitance, 1 pin, 2 pin are alternating current input, 3 pin, 4 pin are that electric current exports, 5 pin are zero line, 6 pin, 7 pin are that induced voltage exports, 6 pin, digital voltmeter is connected between 7 pin, change the capacity of electric capacity C, various cable and line fault can be surveyed.
2. underground power cable fault location device according to claim 1, it is characterized in that: also comprise cable short circuit, earth detector, this device connects potentiometer by between 6 pin of alternating current evener, 7 pin, potentiometer connects voltage amplifier, and voltage amplifier connects voltage table.
3. underground power cable fault location device according to claim 1 and 2; it is characterized in that: also comprise electric discontinuity of cable pick-up unit; this device comprises protection electric capacity C, potentiometer and voltage table; protection electric capacity C output terminal is connected with the A line of cable; after potentiometer R is in parallel with voltage table; output terminal is connected with the B line of cable, and the input end of parallel circuit is connected 220V power supply with between the input end of protection electric capacity C.
4. the balance method of alternating current evener in a underground power cable fault location device according to claim 1, it is characterized in that: 3,4,5 pin O point be connected, electric current through electric capacity C to L1, L2 coil, to 3 pin, 4 pin, to O point, to 5 pin, to 1 pin, L1, L2 two electric currents of coil are equal, electric current is contrary, cancel out each other in magnetic field, L3 does not just have induced voltage, and 6 pin, 7 pin just do not have voltage to export.
5. the method for a underground power cable fault location device detection streamer according to claim 2 short circuit, it is characterized in that: current balancing device 3 pin, 4 pin meet cable head A, B phase, 5 pin connect 4 pin, A, B line to line fault, the electric current of 3 pin through the A phase of cable to short dot, the point from B phase to O again, to 5 pin, the electric current of 4 pin is to O point, again to 5 pin, the head end A of cable, B phase has resistance to short dot, 3 pin, on 4 pin, electric current is just uneven, 6 pin, 7 pin just have voltage to export, cable A, the distance of B phase short dot and cable head is longer, resistance is larger, 6 pin, 7 pin voltages are higher, first correct with the cable of known short dot distance, through voltage amplifier amplification, potentiometer adjustment, make the corresponding 1 meter of short dot distance of 1V voltage on voltage table, during detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable short-circuit position to head end.
6. the method for a underground power cable fault location device detection streamer electric leakage according to claim 2, it is characterized in that: current balancing device 3 pin, 4 pin connect A, B two-phase of cable head, cable tail end A, B two-phase is connected, 5 pin ground connection, 3 pin electric currents to tail end, then click and enter ground by B phase to electric leakage through the A phase of cable; 4 pin electric currents click and enter ground through the B phase of cable to electric leakage; Because leakage is different to the resistance value of 3 pin, 4 pin, so current balancing device is just uneven, 6 pin, 7 pin just have voltage to export, and leakage and cable tail end are apart from longer, and resistance is larger, and 6 pin, 7 pin voltages are higher; First correct with the cable of known leakage distance, through voltage amplifier amplification, potentiometer adjustment, make the corresponding 1 meter of leakage distance of 1V voltage on voltage table; During detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable tail end to leakage.
7. a underground power cable fault location device; it is characterized in that: comprise electric discontinuity of cable failure detector; this device comprises protection electric capacity C, potentiometer and voltage table; protection electric capacity C output terminal is connected with the A line of cable; after potentiometer R is in parallel with voltage table; output terminal is connected with the B line of cable, and the input end of parallel circuit is connected 220V power supply with between the input end of protection electric capacity C.
8. a method for underground power cable fault location device detection streamer according to claim 7 open circuit, is characterized in that: voltage is through electric capacity C by cable A phase, because cable A, B two-phase has line capacitance, B phase line just produces capacitance voltage; First correct with the cable of known length and breakpoint distance, adjustment potentiometer, make the corresponding 1 meter of breakpoint distance of 1V voltage on voltage table; During detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable open-circuit point to head end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510358615.6A CN105044553B (en) | 2015-06-25 | 2015-06-25 | Underground power cable fault location device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510358615.6A CN105044553B (en) | 2015-06-25 | 2015-06-25 | Underground power cable fault location device |
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| CN105044553A true CN105044553A (en) | 2015-11-11 |
| CN105044553B CN105044553B (en) | 2018-02-09 |
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| CN201510358615.6A Expired - Fee Related CN105044553B (en) | 2015-06-25 | 2015-06-25 | Underground power cable fault location device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035097U (en) * | 1988-05-23 | 1989-03-29 | 哈尔滨工业大学 | Cable short-circuit position tester |
| CN2166463Y (en) * | 1993-07-24 | 1994-05-25 | 中国通信建设第一工程局科研所 | Integral tester for failure of communication cable |
| CN2289249Y (en) * | 1996-10-19 | 1998-08-26 | 薛茂林 | Communication cable failure detector |
| US6601001B1 (en) * | 1999-01-13 | 2003-07-29 | Alstom Uk Ltd. | Fault-detection for power lines |
| CN103439636A (en) * | 2012-10-31 | 2013-12-11 | 陕西海泰电子有限责任公司 | Cable open-circuit point position detecting method |
| CN204832415U (en) * | 2015-06-25 | 2015-12-02 | 邵珠真 | Underground power cable trouble range unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203439636U (en) * | 2013-08-21 | 2014-02-19 | 台州飞跃双星成衣机械有限公司 | Device for elevating one side of clothes rack idler wheel of tailoring system |
-
2015
- 2015-06-25 CN CN201510358615.6A patent/CN105044553B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035097U (en) * | 1988-05-23 | 1989-03-29 | 哈尔滨工业大学 | Cable short-circuit position tester |
| CN2166463Y (en) * | 1993-07-24 | 1994-05-25 | 中国通信建设第一工程局科研所 | Integral tester for failure of communication cable |
| CN2289249Y (en) * | 1996-10-19 | 1998-08-26 | 薛茂林 | Communication cable failure detector |
| US6601001B1 (en) * | 1999-01-13 | 2003-07-29 | Alstom Uk Ltd. | Fault-detection for power lines |
| CN103439636A (en) * | 2012-10-31 | 2013-12-11 | 陕西海泰电子有限责任公司 | Cable open-circuit point position detecting method |
| CN204832415U (en) * | 2015-06-25 | 2015-12-02 | 邵珠真 | Underground power cable trouble range unit |
Non-Patent Citations (1)
| Title |
|---|
| 张绍秋 等: "电力电缆缺陷的现场检测及快速定位", 《铁道建筑技术》 * |
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Granted publication date: 20180209 |